package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.CacheConstant;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.*;
import com.sky.webSocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.cache.annotation.Caching;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
@Slf4j
@SuppressWarnings("all")
public class OrderServiceImpl implements OrderService {
    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private WebSocketServer webSocketServer;

    /**
     * 用户催单
     * @param id
     */
    public void reminder(Long id) {
        Orders orders = orderMapper.getById(id);

        //校验订单是否存在
        if (orders == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        Map map = new HashMap();
        map.put("type", 2);//1表示来单提醒 2表示客户催单
        map.put("orderId", id);
        map.put("content", "订单号：" + orders.getNumber());

        String json = JSON.toJSONString(map);
        // 通过WebSocket向客户端浏览器推送消息
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 完成订单
     * @param id
     */
    public void complete(Long id) {
        //根据id查询订单数据
        Orders ordersDB = orderMapper.getById(id);

        //判断当前订单是否为派送中，只有处于派送中的订单才可被完成
        if (ordersDB == null || ordersDB.getStatus() != Orders.DELIVERY_IN_PROGRESS){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //修改订单状态，从派送中状态改为已完成
        ordersDB.setStatus(Orders.COMPLETED);
        // 设置完成时间
        ordersDB.setDeliveryTime(LocalDateTime.now());

        Orders orders = new Orders();
        orders.setId(id);
        orders.setStatus(ordersDB.getStatus());
        orders.setDeliveryTime(ordersDB.getDeliveryTime());

        orderMapper.update(orders);
    }


    /**
     * 派送订单
     * @param id
     */
    public void delivery(Long id) {
        //根据id查询订单数据
        Orders ordersDB = orderMapper.getById(id);

        //判断当前订单是否为待派送
        if (ordersDB == null || ordersDB.getStatus() != Orders.CONFIRMED){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //修改订单状态，从待派送状态改为派送中
        ordersDB.setStatus(Orders.DELIVERY_IN_PROGRESS);

        Orders orders = new Orders();
        orders.setId(id);
        orders.setStatus(ordersDB.getStatus());

        orderMapper.update(orders);
    }

    /**
     * 取消订单
     * @param ordersCancelDTO
     */
    public void cancel(OrdersCancelDTO ordersCancelDTO) throws Exception {
        //根据id查询订单数据
        Orders orders = orderMapper.getById(ordersCancelDTO.getId());

        //判断当前订单是否可被取消
        if (orders == null || orders.getStatus() != Orders.CONFIRMED){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //TODO: 搞清楚微信支付操作到底是如何实现的
        //用户是否已付款，如果已付款，则需要退款
        Integer payStatus = orders.getPayStatus();
        if (payStatus == Orders.PAID){
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    orders.getNumber(),
                    orders.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }

        //根据id修改订单数据，修改订单状态为已取消，更新拒绝原因，取消时间
        orders.setRejectionReason(ordersCancelDTO.getCancelReason());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelTime(LocalDateTime.now());

        //更新订单数据
        orderMapper.update(orders);
    }

    /**
     * 拒绝订单
     * @param rejectionDTO
     */
    @Transactional
    public void rejection(OrdersRejectionDTO rejectionDTO) throws Exception {
        //根据id查询订单数据
        Orders orders = orderMapper.getById(rejectionDTO.getId());

        //判断当前订单是否可被取消
        if (orders == null || orders.getStatus() != Orders.TO_BE_CONFIRMED){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //TODO: 搞清楚微信支付操作到底是如何实现的
        //用户是否已付款，如果已付款，则需要退款
        Integer payStatus = orders.getPayStatus();
        if (payStatus == Orders.PAID){
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    orders.getNumber(),
                    orders.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));
            log.info("申请退款：{}", refund);
        }

        //根据id修改订单数据，修改订单状态为已取消，更新拒绝原因，取消时间
        orders.setRejectionReason(rejectionDTO.getRejectionReason());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelTime(LocalDateTime.now());

        //更新订单数据
        orderMapper.update(orders);
    }

    /**
     * 订单确认
     * @param ordersConfirmDTO
     */
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {
        //将订单状态改为已接单
        ordersConfirmDTO.setStatus(Orders.CONFIRMED);
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersConfirmDTO, orders);
        orderMapper.update(orders);
    }

    /**
     * 获取订单详情
     * @param id
     * @return
     */
    public OrderVO getById(Long id) {
        //根据id查询订单数据
        Orders orders = orderMapper.getById(id);

        //创建一个VO对象，用于封装返回数据
        OrderVO orderVO = new OrderVO();

        if (orders != null) {
            //获取订单菜品详细信息
            List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

            //封装VO数据
            BeanUtils.copyProperties(orders, orderVO);
            //获取订单菜品信息
            String orderDishesStr = getOrderDishesStr(orders);
            orderVO.setOrderDishes(orderDishesStr);
            orderVO.setOrderDetailList(orderDetailList);

        }else {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);//订单不存在
        }

        return orderVO;
    }

    /**
     * 用户下单
     * @param ordersSubmitDTO
     * @return
     */
    @Transactional
    public OrderSubmitVO submitOrder(OrdersSubmitDTO ordersSubmitDTO) {
        //处理各种业务异常（地址簿为空，购物车数据为空）
        AddressBook addressBook = addressBookMapper.getById(ordersSubmitDTO.getAddressBookId());
        if (addressBook == null) {
            //抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }

        //查询当前用户的购物车数据
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null || shoppingCartList.size() == 0) {
            //抛出业务异常
            throw new AddressBookBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        //向订单表插入1条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);

        orderMapper.insert(orders);

        //向订单明细表插入n条数据
        List<OrderDetail> orderDetailList = new ArrayList<>();

        for (ShoppingCart Cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();//订单明细
            BeanUtils.copyProperties(Cart, orderDetail);
            orderDetail.setOrderId(orders.getId());//设置订单明细关联的订单id
            orderDetailList.add(orderDetail);
        }
        orderDetailMapper.insertBatch(orderDetailList);

        //清空用户的购物车
        shoppingCartMapper.deleteByUserId(userId);

        //封装VO返回结果
        OrderSubmitVO orderSubmitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderNumber(orders.getNumber())
                .orderTime(orders.getOrderTime())
                .orderAmount(orders.getAmount())
                .build();

        return orderSubmitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        // 通过WebSocket向客户端浏览器推送消息
        Map map = new HashMap();
        map.put("type", 1);//1表示来单提醒 2表示客户催单
        map.put("orderId", ordersDB.getId());
        map.put("content", "订单号：" + outTradeNo);

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    /**
     * 根据订单id查询订单详情
     * @param id
     * @return
     */
    public OrderVO getByOrderId(Long id) {
        //根据id查询订单
        Orders orders = orderMapper.getById(id);

        //根据订单id查询订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        //将数据封装到OrderVO中
        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orders, orderVO);
        orderVO.setOrderDetailList(orderDetailList);

        return orderVO;
    }

    /**
     * 用户端订单分页查询
     *
     * @param pageNum
     * @param pageSize
     * @param status
     * @return
     */
    public PageResult getHistoryOrders(int pageNum, int pageSize, Integer status) {
        //设置分页
        PageHelper.startPage(pageNum, pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        //分页条件查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();

        //查出订单明细,封装到OrderVO中返回
        if (page != null && page.getTotal() > 0){
            for (Orders orders : page) {
                Long id = orders.getId();//订单id

                //根据订单id查询订单详情
                List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

                //封装OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                orderVO.setOrderDetailList(orderDetailList);

                list.add(orderVO);
            }
        }
        return new PageResult(page.getTotal(), list);
    }

    /**
     * 用户取消订单
     * @param id
     */
    public void cancelById(Long id) throws Exception {
        //根据id查询订单
        Orders orders = orderMapper.getById(id);

        //校验订单是否存在
        if (orders == null){
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        //查询订单状态
        if (orders.getStatus() > 2){
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        // 订单处于待接单状态下取消，需要进行退款
        if (orders.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            //调用微信支付退款接口
            weChatPayUtil.refund(
                    orders.getNumber(), //商户订单号
                    orders.getNumber(), //商户退款单号
                    new BigDecimal(0.01),//退款金额，单位 元
                    new BigDecimal(0.01));//原订单金额

            //支付状态修改为 退款
            orders.setPayStatus(Orders.REFUND);
        }

        // 更新订单状态、取消原因、取消时间
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 再来一单
     * @param id
     */
    public void repetition(Long id) {
        //得到当前用户id
        Long userId = BaseContext.getCurrentId();

        //根据id查询订单明细
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(id);

        //创建购物车对象集合
        List<ShoppingCart> shoppingCarts = new ArrayList();
        for (OrderDetail orderDetail : orderDetailList) {
            //将订单明细对象转换为购物车对象
            ShoppingCart cart = new ShoppingCart();
            BeanUtils.copyProperties(orderDetail, cart);
            cart.setUserId(userId);
            cart.setCreateTime(LocalDateTime.now());

            shoppingCarts.add(cart);
        }

        //将购物车对象集合批量添加到数据库
        shoppingCartMapper.insertBatch(shoppingCarts);
    }

    /**
     * 管理端订单分页查询
     * @param ordersPageQueryDTO
     */
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(), ordersPageQueryDTO.getPageSize());
        //分页查询
        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        //将查询的数据封装到OrderVO中
        List<OrderVO> list = new ArrayList<>();

        if (page != null && page.getTotal() > 0){
            for (Orders orders : page) {

                //封装OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                //填充订单菜品信息
                String orderDishes = getOrderDishesStr(orders);
                orderVO.setOrderDishes(orderDishes);

                list.add(orderVO);
            }
        }else {
            throw new OrderBusinessException(MessageConstant.ORDER_IS_EMPTY);
        }

        return new PageResult(page.getTotal(), list);
    }

    /**
     * 根据订单id获取菜品信息字符串
     * TODO 待完善
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }

    /**
     * 统计各个状态订单数量信息
     * @return
     */
    public OrderStatisticsVO statistics() {
        OrderStatisticsVO orderStatisticsVO = orderMapper.statistics();
        return orderStatisticsVO;
    }


    //TODO：检验收货地址是否超过配送范围功能待开发
}
